Fortfolio · Portfolio Stress Tester
How would your portfolio
survive a market crash?
Test your holdings against 10 historical crises — the dot-com bust, 2008, COVID, and more. No login. Results shareable in seconds.
Add your stocks below, or pick a sample portfolio to see how it works.
Holdings
Total: 100%
Sample portfolios
Sample preview — run with your portfolio for real results
Sample portfolio
60% SPY · 40% AGG
Vs benchmark
Beat SPY in 6/10 crises
Worst drawdown
−34%
Add your holdings above, then press Run to see your portfolio across all 10 historical crises.
Past performance does not guarantee future results. Educational purposes only — not financial advice.
From the Learn library
How a portfolio stress test works
What the 10-crisis backtest does, what it doesn't do, and how to read the result
What the 4% rule actually means
Where Safe Withdrawal Rate comes from, what monotonic survival implies, and why simulations matter
Flow strategy triggers — vix, regime, momentum, and when each fires
A tour of the flow builder triggers, what each one detects, and when they fire on historical data
01
Enter holdings
Add your stocks and ETFs with % weights
02
Run the test
We replay 10 real market crises against your portfolio
03
Compare portfolios
Tweak your mix and see how the numbers shift